Index: plasma-nm-5.15.5/vpn/strongswan/nm-strongswan-service.h
===================================================================
--- plasma-nm-5.15.5/vpn/strongswan/nm-strongswan-service.h
+++ plasma-nm-5.15.5/vpn/strongswan/nm-strongswan-service.h
@@ -37,6 +37,9 @@
 #define NM_STRONGSWAN_INNERIP "virtual"
 #define NM_STRONGSWAN_ENCAP "encap"
 #define NM_STRONGSWAN_IPCOMP "ipcomp"
+#define NM_STRONGSWAN_PROPOSAL "proposal"
+#define NM_STRONGSWAN_IKE "ike"
+#define NM_STRONGSWAN_ESP "esp"
 
 #define NM_STRONGSWAN_AUTH_KEY "key"
 #define NM_STRONGSWAN_AUTH_AGENT "agent"
Index: plasma-nm-5.15.5/vpn/strongswan/strongswanprop.ui
===================================================================
--- plasma-nm-5.15.5/vpn/strongswan/strongswanprop.ui
+++ plasma-nm-5.15.5/vpn/strongswan/strongswanprop.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>490</width>
-    <height>460</height>
+    <width>518</width>
+    <height>581</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -287,6 +287,50 @@
       </item>
      </layout>
     </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="proposal">
+     <property name="title">
+      <string>Enable Custom Cipher Proposals</string>
+     </property>
+     <property name="checkable">
+      <bool>true</bool>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout_3">
+      <item>
+       <layout class="QFormLayout" name="formLayout_6">
+        <item row="0" column="0">
+         <widget class="QLabel" name="label_3">
+          <property name="text">
+           <string>IKE:</string>
+          </property>
+         </widget>
+        </item>
+        <item row="0" column="1">
+         <widget class="QLineEdit" name="ike">
+          <property name="toolTip">
+           <string>A list of proposals for IKE separated by &quot;;&quot;</string>
+          </property>
+         </widget>
+        </item>
+        <item row="1" column="0">
+         <widget class="QLabel" name="label_3">
+          <property name="text">
+           <string>ESP:</string>
+          </property>
+         </widget>
+        </item>
+        <item row="1" column="1">
+         <widget class="QLineEdit" name="esp">
+          <property name="toolTip">
+           <string>A list of proposals for ESP separated by &quot;;&quot;</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </widget>
    </item>
    <item>
     <spacer name="verticalSpacer">
Index: plasma-nm-5.15.5/vpn/strongswan/strongswanwidget.cpp
===================================================================
--- plasma-nm-5.15.5/vpn/strongswan/strongswanwidget.cpp
+++ plasma-nm-5.15.5/vpn/strongswan/strongswanwidget.cpp
@@ -49,6 +49,7 @@
 
     // Connect for validity check
     connect(d->ui.leGateway, &QLineEdit::textChanged, this, &StrongswanSettingWidget::slotWidgetChanged);
+    connect(d->ui.proposal, &QGroupBox::toggled, this, &SettingWidget::settingChanged);
 
     KAcceleratorManager::manage(this);
 
@@ -97,6 +98,9 @@
     d->ui.innerIP->setChecked(dataMap[NM_STRONGSWAN_INNERIP] == "yes");
     d->ui.udpEncap->setChecked(dataMap[NM_STRONGSWAN_ENCAP] == "yes");
     d->ui.ipComp->setChecked(dataMap[NM_STRONGSWAN_IPCOMP] == "yes");
+    d->ui.proposal->setChecked(dataMap[NM_STRONGSWAN_PROPOSAL] == "yes");
+    d->ui.ike->setText(dataMap[NM_STRONGSWAN_IKE]);
+    d->ui.esp->setText(dataMap[NM_STRONGSWAN_ESP]);
 }
 
 void StrongswanSettingWidget::loadSecrets(const NetworkManager::Setting::Ptr &setting)
@@ -148,6 +152,12 @@
     data.insert(NM_STRONGSWAN_INNERIP, d->ui.innerIP->isChecked() ? "yes" : "no");
     data.insert(NM_STRONGSWAN_ENCAP, d->ui.udpEncap->isChecked() ? "yes" : "no");
     data.insert(NM_STRONGSWAN_IPCOMP, d->ui.ipComp->isChecked() ? "yes" : "no");
+    if (d->ui.proposal->isChecked()) {
+        data.insert(NM_STRONGSWAN_PROPOSAL, "yes");
+        data.insert(NM_STRONGSWAN_IKE, d->ui.ike->text());
+        data.insert(NM_STRONGSWAN_ESP, d->ui.esp->text());
+    } else
+        data.insert(NM_STRONGSWAN_PROPOSAL, "no");
 
     // save it all
     setting.setData(data);